Bookbinder



Nov. 19, 1935. A.-F. GROSSE El AL- BOOKBINDER Filed May 28, 19134 v INVENTORSJ Patented Nov. 19, 1935 r UNITED STATES BOOKBINDER Adolph Frank Grosse and Aloysius C. Baumgartner, Duluth, Minn.

Application May 28, 1934, Serial No. 727,952

5 Claims.

This invention relates to loose leaf binders, and has for its principal object to provide a more practical and efficient binder than heretofore known.

Other objects and advantages of the invention will appear in the following description thereof.

Referring now to the accompanying drawing, forming part of this application, and wherein like reference characters indicate like parts:

Figure 1 is a perspective View of one corner of the binder having one form of the invention applied thereto.

Figure 2 is a transverse section through the center of the cooperative rack members.

Figure 3 is an enlarged perspective view of one form of clamping member.

Figure 4 is a perspective view of a modified form of clamping member.

Figure 5 is a perspective View of one corner of a binder having a clamping member such as illustrated in Figure 4 applied thereto.

Figure 6 is an enlarged sectional view through the back of a binder having a still further modified form of the invention applied thereto.

Figure 7 is a perspective view of the clamping member illustrated in Figure 6.

Referring now to the illustrations in Figures 1, 2 and 3, the numerals I and 2 represent the inner and outer back walls respectively of the box like portion of the back of the binder, and which box like structure carries the vertically adjustable telescopic holding members 3 and 4 common to such binders and upon which the loose leaves to be held within the binder are placed.

Inwardly from the ends of the back wall members I and 2 are fixed the rack members 5 and 6, they having cooperative teeth upon the inner faces thereof, which teeth interlock as shown in Figure 2, when the walls I and 2 are held tightly together. For this purpose I have illustrated in Figures 1, 2 and 3 the pivotally mounted catch I, its pivotal support being in the form of a relatively large rivet 8 through the outer wall member 2, and this catch is so positioned that when swung upwardly the lug 9, formed integral with the catch, its free end being spaced from the body thereof, will pinchingly engage the edge of the wall I, thus holding the two walls tightly together, as the catch is mounted upon the wall 2 as before stated. The catch, if preferred, may be carried upon the outer side of the wall instead of the inner side as illustrated, but since it is made of thin sheet metal it would not be objectionable upon the inner face of the wall. For

convenience in manipulation of the catch it is provided with a finger clip It! upon the free end thereof, and which, when the catch is folded inwardly occurs fiush with the ends of the walls I and 2. We are aware that rack like members 5 have been used in connection with binders of this character, but never, to our knowledge, in the cooperative manner or engageable as here shown and described.

In Figures 4 and 5 is illustrated a modified form 10 of catch I I being turned at right angles as at I2 and again parallel with the body portion as at I3. The latter is provided with a struck out clip I l for convenience in finger manipulation of same, and which body portion of the catch is provided with a central longitudinal slot I5, designed to be slidably mounted upon a pair of rivets I6 through" the outermost wall I! of the binder so that when the catch is thrust inwardly the lip or portion I3 will pinchingly engage the inner wall 18 of the binder and thus hold the cooperative rack portions, which are in close juxtaposition, in engaged relation, to prevent the walls l1 and I8 from being separated without first adjusting the catch. 5

In Figures 6 and '7 is illustrated a still further modification of catch, the lever I9 of which carries fixed thereto the pin 20 having its head 2| slidably engaged within the T-shaped slot 22 formed adjacent the end of the outer wall 23 of the binder and pivotally mounted within the through slot 25 in the inner wall 26 of the back of the binder. The lever I9 is provided with the semi-circularly shaped lugs 21, one upon either side of the pin 20, and the slot 25 is provided along its edges with a slotted wearing plate illustrated at 28 so that when the lever is turned to a position at right angles to the axis of the slot 25 these lugs 21 will occur transversely of and lie within the slot 25, thus permitting the wall 26 to move away from the wall 23 a distance equal to the height of the lugs 21 and thereby freeing the engagement of the rack plates 29 and 30. But when the lever I9 is turned to parallel alignment with the slot, or to its innermost position in respect to the back of the binder, the lugs will ride up on the edges of the slot in the wear plate 28 and. thereby the walls 23 and 25 will be held tightly together as illustrated in Figure 6 of the drawing. For convenience of manually manipulating the lever I9 we have shown the small clip 30 on the terminal thereof.

In practice it has been found that the modification of the invention illustrated in Figures 4 and 5 is best adapted for use in connection with smaller sized loose leaf binders, and that the form shown in Figures 1, 2 and 3 is best adapted for use on binders of intermediate size, whereas the modification illustrated in Figures 6 and '7 is best adapted for use on large sized binders.

Having thus described our invention, what we claim and desire to secure by Letters Patent, is:

1. A loose leaf binder comprising cover members, each having an end turned at right angles thereto and adapted to slide one against the other, interengageable rack means secured to said ends, and lever means pivoted to one of said ends and engageable with the other end to hold said ends in any adjusted position.

2. A loose leaf binder having means for adjusting the capacity of said binder including in.- terlocking toothed racks carried upon the cooperative portions of the back of said binder, and means upon one of said back portions for pinching engagement with the other of said back portions for optionally engaging or releasing said racks.

3. A loose leaf binder comprising cover members each having an end turned at right angles forming a back portion, said back portions being adjustable in respect to each other for varying the capacity of the binder, means for holding said back portions in any adjusted position, said means comprising a pair of interengageable toothed racks one secured to each of the back portions, and means adjustably fixed to one back portion and engageable with the other back portion for holding said racks in engaged relation.

4. A loose leaf binder comprising cover members each having an end turned at right angles forming a back portion, said back portions being adjustable in respect to each other for varying the capacity of the binder, means for holding said back portions in any adjusted position, said 10 means comprising a pair of interengageable toothed racks one secured to each of said back portions, and a catch slidably secured to one of the back portions and overlappingly engageab-le with the other of said back portions to selectively hold the racks in engaged relation.

5. A loose leaf binder comprising cover members each having an end turned at right angles forming a back portion, said back portions being adjustable in respect to each other for varying the capacity of said binder comprising interlock ing toothed racks carried upon the cooperative portions of the back of said binder, and lever means pivotally secured to one of the portions of the back of the binder and overlappingly engageable with the other of said portions to hold the same in any adjusted position.

ADOLPH FRANK GROSSE. ALOYSIUS C. BAUMGARTNER. 

